Negotiators for the (Massachusetts) House and Senate will have much to debate when they meet this month to hash out their differences over what could be the state’s biggest energy bill in two decades.

The House version is simple, essentially requiring utilities to buy up to 1,200 megawatts of Canadian hydropower and a similar amount from proposed offshore wind farms to make the region’s energy mix more environmentally friendly.

In contrast, the bill the Senate passed Thursday is far broader, involving many forms of energy